Wheel dressing fixture



March 3, 1942- G. E. HEA'DBLooM ETAL. 2,274,959

WHEEL DRESSING FIXTURE 2 Sheets-Sheet l Filed June 13, 1925)` INVENToRs v susr :.HEADBLDOM PA .PETERS N 0M L -,v7 ATTORN YS ULT Mardi 3, 1942 G. E. HEADBLooM ETAL WHEEL DRESSING FIXTURE Filed June 13, 1939 2 Sheets-Sheet 2 FIGA.

INVENTORS GUST E HEADBLOOM PAU T PETERS ATTORNEY Patented Mar. 3, 1942 2,274,959 WHEEL DRESSING FIXTURE .Gust E. Headbloom and Paul T. Peterson, Detroit,

Mich., assignors to Apex Broach Company, Detroit, Mich., a corporation of Michigan Application June 13, 1939, Serial No. 278,929

(Cl. 12S-11) 2 Claims.

vwheel upon a true radius.

Other objects and advantages will readily occur to those skilled in the art upon reference to the following description andthe accompanying drawings in which Figure l is a plan view of the xture with the cover removed but indicated.

Figure 2 is a side elevation of the same but showing the circular dresser in place.

Figure 3 is a partial elevation with parts in section and viewed as from the right of Figure 1.

Figure 4 is a section on line 4 4 of Figure 1 but with the tool support omitted, and

Figure 5 is a section through the tool holding l head and showing this construction.

As indicated in the drawings the device com'- prises a base IB provided with slides II adapted to fit into the slotted bed (notshown) of the machine carrying a wheel to be' dressed.

In the central portion of the base I0 is xed a vertically arranged hollow pin I2 maintained against turning by a suitable key I3 and held by a nut I4. This pin l2, as shown best in Figure 4, is provided with a small flange I5 a short distance above the base I0 and is shouldered at the base I D.

Rotatably mounted upon the pin I2 and resting upon the base Ill, being held in place by the flange I5, isa plate IB having slide grooves along its lateral edges to receive the slides IT formed upon the inner faces of two longitudinal frame members I8, a substantially rectangular frame being completed by the cross members I9 and 20.

This frame I8--20 is, as indicated, slidable upon the plate i6 and is adjustably located by the screw 2I passing through cross member 20 and acting against plate I6, the screw ZI being actuable by the knurled knob 22 and lixed in posi- .tion by lock nuts 23.

The cross member I9 is, as indicated, L-shaped in section with the overhanging portion extending laterally the full width of the Aframe and extending longitudinally of the frame a suicient v25, these edges being nished to distance to overlie a pair of antifriction bearings 25, the inner races of which rest upon frame members I8 andare held in place by the screw studs 26 passing through the overhung member I9 and into members I8. The outer races of the bearings 25 are free to rotate and serve as rollers for the carriage about to be described. I The carriage consists of a member 30 suicient- 4ly long to project'beyond frame members I8 and Z-shaped in section. This rests upon the plate I6 with its forwardly projecting portion 3| extending under the edge of the overhanging portion of frame member I9 and against the rollers provide a holddown slide-for the carriage.

The rear face of carriage 30 is stepped to provide a vertical lower wall portion 32 and an overhanging portion extending back ashort distance above the level of the pin I2, while the upper face of the carriage is provided with an elevated seat 33 intermediate the ends of member 30 but extending the greater portion of its length. This seat is provided at its4 center line with a rectangular notch 34 and at each end with a hinged screw 35, each with a knurled nut 36.

Adapted to cooperate with the carriage wall 32 is a disc 40 mounted upon pin I2 and fixed against rotation by means of a. set screw 4I. This disc 40 is removable and different sizes of discs may be substituted therefor, by iirst loosening screw ZI to permit the entire frame and associated parts to be moved to the right (Fig. l). After the new disc has been mounted upon pin I2 the frame assembly is moved back to press the carriage lightly between the disc and the rollers 25 Upon the seat 33, for the purpose of producing an involute curve, is mounted a tool carrier d5, notched at the ends of its base portion to receive the screws 35, bymeans of which the carrier is secured upon the seat. The carrier i5 has at one end a standard 46 having suitable means for xing in horizontal position a dressing tool d] provided with a diamond point 48, and the itxing means shown is a suitable nut di threaded on the tool 4l and arranged in'a notch in the standard 46, a set screw 5I likewise being used.

In positioning the tool 41, the point 48 is arranged in vertical alignment with the face 32 of the carriage and to one side ofthe vertical longitudinal center plane of theassembly, the axis of disc 40 being in this center plane and the rollers 25 being equidistant therefrom.

kAs indicated best in Figures 1 and 2, centering means for the frame assembly lupon the'base is grind involute gear teeth, the curve of the wheel and additional means for centering the carriage 30 is provided in a pin 6| extending horizontally through frame member l 9 into a suitably located notch 62 in carriage 30. provided with notches 63 adapted to cooperate with a spring pressed ball detent 64 to determine its position.

In using the fixture to dress a wheel, the pin 60 will of course be removed and the pin 6l withdrawn from the notch 62. Then, with the tool 4B in engagement with the wheel to be dressed, the frame and associated elements will be swung laterally around pin l2 as a center. This action causes the carriage to move lengthwise, since lthe disc 40 is fixed and in tight contact with the face 32 of the carriage, while therollers 25 are free to turn. Such movement will, of course, cause the point of-tool 41 to move in a curve having a constantly changing radius. When,`however, it is desired to produce a curve with a constant radius, the tool 41 is mounted in a tool holder such as is indicated in Figure v2.

In this figure, the tool holder 45a is a standard having at its lower end a post or stud 46a tting rotatably into the central bore of pin I2 and rotatably by means of a suitable handle 41a. In

the operation, the carriage 30 may remain fixed in position by the pins 60 and 6I.

In order to prevent the smooth operation of carriage 30 upon plate I6 and thereby its accuraoy, due to the accumulation of dust or other particles, it is preferred to provide-that portion This pin 6| is itself n surface will, of course, be concave and the above dressing tool setting will produce such a surface. However, if it is desired to produce a convex involute surface upon the wheel, for example, for grinding a broach such as is shown in our cpending application kSerial No. 278,928, filed on even date herewith, the dressing tool point will be moved across the center line from the position shown. With -such positioning, the wheel will be dressed with a convex involute curved surface.

What we claim is:

1. A wheel dressing fixture consisting of a base provided with an upwardly projecting pin, a frame assembly resting on said base and rotatable V about said pin, a pair of rollers with vertical axes carried by the forward end of said assembly and equidistant from said pin, a laterally movof the plate upon which the carriage rests, with intersecting grooves as shownI at 10.

It should be noted that 1n Figures 1 and 3, the fixture is shown with the diamond tool point located on the line of the face 32 in contact with disc and a short distance to one side (behind) the center line. In dressing a wheel intended to able carriage mounted upon said assembly between said rollers and said pin, a cylindrical disc xed upon said pin, means for clamping said carriage between said rollers and the cylindrical edge of said disc, and a dressing tool fixed upon said carriage.

2. A wheel dressing fixture consisting of a base provided with an upwardly projecting pin, a plate rotatably mounted upon said pin and carrying a slidableframe, a carriage mounted upon said frame and movable laterally thereof, a cylindrical disc fixed upon said pin above said plate, antifrlction rollers upon said frame, said carriage being located between said disc and said rollers, means for sliding said frame upon said plate whereby to press said carriagevbetween said disc and said rollers, a dressing tool mounted upon said carriage, means for fixing at will said plate against rotation, and means for centering said carriage.v l

GUST E. HEADBLOOM. PAUL T. PETERSON. 

